Refactor trailing comma comment adjustment (#10380)

* Refactor trailing comment adjustment

Following up from https://github.com/babel/babel/pull/10369

- Unify the logic for adjusting trailing comments into a separate
  function
- Use it for all three cases, which fixes a bug for ObjectExpressions
  and CallExpressions
- Update tests to check for the fixed bug

* Fix tests

- Only modify trailingComments if necessary
- Update snapshots of a couple of affected tests

* Drop the underscore in adjustCommentsAfterTrailingComma_

* Handle ArrayPattern

* Handle ObjectPattern

* Handle import and export declarations

These have to be handled a bit differently, because the  node is visited after the  and before the declaration. So we intercept when we are going from the last specifier to the source node.

* Remove unnecessary check

packages/babel-parser/test/fixtures/comments/basic/switch-function-call-no-semicolon/output.json

@@ -250,25 +250,7 @@
                 "label": null
               }
             ],
-            "test": null,
-            "leadingComments": [
-              {
-                "type": "CommentLine",
-                "value": " comment",
-                "start": 47,
-                "end": 57,
-                "loc": {
-                  "start": {
-                    "line": 4,
-                    "column": 4
-                  },
-                  "end": {
-                    "line": 4,
-                    "column": 14
-                  }
-                }
-              }
-            ]
+            "test": null
           }
         ]
       }